How can I downgrade from v 3.0 to 2.2.1 please HELP!!!!

Hi!
I have an iPod Touch 2G and everything was working perfect, I use my ipod to watch some videos on TV then I bought a AV TV out cable and was working beautiful, BUT I saw the update to version 3.0 and I wanted to use the bluetooth option which came with that update, after I bought the version 3.0 the AV cable stop working and keeps telling me is not supported for this ipod when was working perfect before!!! Then I need to downgrade to the last version because I care more about watching the videos on TV than the bluetooth option, I don't care loosing the money I paid for the upgrade just need to fix this problem without spending more money!!!! Please help me because I use this videos for school because I am a teacher and I need my lessons as soon as posible!!!
Thanks!
[email protected]

I was able to revert to 2.2.1 (my issue was wireless router compatibility), but couldn't find the details here, or elsewhere in apple support space.
Does apple actively suppress them?
I was able to get the 2.2.1 firmware googling around, I used a German site.
I had to put my iPod into the mysterious DFU mode (a slightly tricky combination of holding the power and home buttons, googled from another site) to get the restore to take. But, then, I was able to shift-click restore and load the 2.2.1 version from a file.
There seems to be a lot of not-quite-correct information floating around the web, so it takes a bit of googling, a bit of sorting, and a bit of persistence. Maybe the same procedure doesn't work for everyone.
I'd post more complete details (e.g. with links) here, but I have a sneaking suspicion that they wouldn't survive.

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